Two-cycle motor.



@ATBNTED FEB. v, 1905.

E. KGRTING.

TWO CYCLE MOTOR.

APPLIUATION NLRB 0015, 1901.

EWW MW & Mama Patented February 7, 1905.

UNITED STaTEs PATENT QEETcE.

ERNST KORTINH, OF KOR'FINGSDORI, (*ll lhh IANY.

TWO-CYCLE MOTOR.

SPECIFICATION forming part of Letters Patent No. 781,889, dated February'7, 1905.

Application filed October 5,1901. Serial No. 77,657.

To 71]] //'/1 onl if lii/rl HON/0GP:

Be it known that l, ERNST Kfnrrixo, a subect of the lung of Prussia,Emperor of tiermany, residing at Kortingsdort', nea'r llan- I over,lxingdom of Prussia, German Empire, have invented new and usefulImprovements in llwoG vcle Motors, of which the following is aspecification.

The improvements according to this invention are intended to be appliedto two-cycle motors in which the charge is supplied by separate air andgas pumps; and it consists in adaptii'ig the quantity of gas supplied tothe power to be developed by providing in the gaspump, between thecompression-ehamber and the end of the (pump) cylinder, a by-pass, thesize of which can be altered by means of a closing device controlled bythe governor. \Yhen the gas-pump is pumping, a portion of the gasalready supplied is pumped out again. the quantity thus pumped backvarying according as the by-pass is opened to a greater or less extent.The quantity of gas drawn in afresh and supplied during the nextcompression-stroke is varied accordingly, and the charge is thusrendered richer or poorer.

The accompanying drawings show diagrammatically the improvementaccording to this invention.

Figure 1 shows the arrangement of pumps and valve-gear for distributingair and gas tor the double-acting two-cycle motor. Fig. 2 is a t'orceback the air which entered the pipe pdetail of a gas-pump withindependent valves. Fig. 3 is a detail sectional view, on a smallerscale, showing the mixing-valve at one end of the power-cylinder.

zis themotor-cylinder,with piston-rod, connecting-rod, and crank.

/is the air-pump; 1/1, the gas-pump, the pistons of both the pumps beingmounted on the same rod 1 The gas-pump is also pro- The air-pump has anordinary 3 so that the air and the gas meet in the inletvalve chamber ormixing-chamber and form the explosive mixture.

The peculiarity ol the gas-pump is that its compression-cliamber1/ isplaced in communieation with the back end ot' the cylinder 11/ by meansof a passage 1/, closed by a valve r, the position of which, andeonsequentlythe degree to which the said passage (1 is opened, isregulated by a system ot levers w, controlled by the governor.

c is the suctionchamber ot' the pump.

hen the motor is workii'ig, the air-pump is always supplying, throughthe pipes o, the full quantity of air-- 1 the volume displaced by thepiston *and always draws in from the outside a similar quantity of freshair; but in the case of the gas-pump it is different. hen the gas-pumpis pumping with the bypass I! opened to a greater or lesser extent, moreor less gas is sucked back again from the compression-chamber u or pipep, which is in communication with the pipe I), through the chamber 1/,above the iiiixiiigval\'e n, so that in this case air is drawn from thepipe 1) into the pipe 1. During the next compression-stroke the gas-pumpdelivers either the whole or part of the volume displaced by the pistonto the inlet-valve; but before this gas can reach the inlet-valvechamber through the pipe 1 it must replace the amount of gas or airpreviously pumped back tliat is to say,

so that in reality the amount of gas supplied to the driving-cylinderthrough the inletvalve will be less by the quantity pumped back duringthe suction-stroke. and consequently the motor will developcorrespondingly less power. As the pistons of both the air and gas pumpalways move through the same length, the relation of the quantity of airto that of the gas supplied in the same time always re mains constantand equal to the relation between the pistons. As soon as during thecompression-stroke ot' the gas-pump the gas reaches the inlet-valve andbegins to mix with the air entering at the same time the proportion isthe right one. The quality of the entering mixture remains, therefore,always the same. Only its quantity changes. The quantity of the enteringair remains, on the contrary, constant, and until during thecompression-stroke of the pump gas reaches the inletvalve fresh airenters the motor-cylinder and then up to the end of thecompression-stroke follows the explosive mixture.

In the modification shown in Fig. 2, a is the compression-chamber; 6,the port leading to the cylinder end; 0, suction-chamber; (Z, theby-pass with the valve 1'; g, the suction-valve; h, discharge-valve ofthe pump; 71, an opening in the center of the cylinder communicatingwith the suction-chamber. During the suction-stroke the suction-valve gis raised and the gas from the suction-chamber c enters the cylinder. Assoon as the piston has passed the opening 6 the gas enters the cylinderthrough this opening as well. During the next compression-stroke the gasis at first forced back again through the opening z' until the pistonhas passed by it. Only after having passed the opening 6, the piston canforce gas through the discharge-valve 7L into the compression-chamber a.When the by-pass (Z is closed, the gas-pump supplies at each strokeabout fifty per cent. of its volume. It the valve in the by-pass (Z isplaced in a suitable position by the governor, the gas can flow backfrom the compression-chamber a during the whole of the suction-stroke,and during the first half of the compression-stroke this gas will enterthe pump-cylinder, so thata correspondingly smaller quantity will bedrawn in through the suction-valve 9. During the first portion of thecompression-stroke the gas would also escape back through the cylinderand the opening 2'.

That I claim, and desire to secure by Letters Patent of the UnitedStates, is

1. In an internal-combustion engine, the combination with the workingcylinder, of a pump for air, a pump for gas, a pressurechamber connectedwith the cylinder of the gas-pump, a mixing-chamber connected with theworking cylinder and the air-pump and said pressure-chamber, a valve forthe admission of gas to the gas-pump, a by-pass between the end of thecylinder of the gas-pump and the pressure-chamber, and athrottlingdevice located in the by-pass and controlled by the governor,substantially as described.

2. In an internal-combustion engine, the combination with the workingcylinder, of a pump for air, a pump for gas, a pressurechamber connectedwith the cylinder of the gas-pump, a mixing-chamber connected with theworking cylinder and the air-pump and said pressure-chamber, independentsuction and discharge valves for the admission of gas into the cylinderof the gas-pump and its discharge therefrom, a by-pass between the endof the cylinder of the gas-pump and the pressure-chamber, and athrottling device located in the by-pass and controlled by the governor,substantially as described.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ERNST KORTING.

WVitnesses:

LEONORE RAsoH, J AY WHITE.

